Stadium: Court 4 Round: 25 Ground: Clay
| ITF Women Ankara | 2016/12/21 09:05 | Sofia Shapatava v Elitsa Kostova | 7-6,4-6,4-6 |
| WTA Acapulco Qual | 2018/02/25 03:20 | Rebecca Peterson v Elitsa Kostova | 7-5,6-1 |
| ITF Women Rancho Santa Fe | 2018/02/23 20:10 | Elitsa Kostova v Kurumi Nara | 6-7,0-6 |
| ITF Women Rancho Santa Fe | 2018/02/22 23:40 | Danielle Lao v Elitsa Kostova | 6-4,1-6,3-6 |
| ITF Women Rancho Santa Fe | 2018/02/21 20:30 | Elitsa Kostova v Ashley Lahey | 4-6,6-3,6-1 |
| ITF Women Surprise | 2018/02/15 20:45 | Julia Boserup v Elitsa Kostova | 7-5,3-6,6-1 |
| WTA Newport Beach | 2018/01/23 18:00 | Rebecca Peterson v Elitsa Kostova | 4-6,6-3,7-5 |
| WTA Newport Beach Qual | 2018/01/21 18:00 | Caroline Dolehide v Elitsa Kostova | 4-6,4-6 |
| WTA Newport Beach Qual | 2018/01/20 20:15 | Emina Bektas v Elitsa Kostova | 2-6,7-5,1-6 |
| ITF Women Santa Margherita Qual | 2018/03/13 13:00 | Sofia Shapatava v Sarah Beth Grey | 6-2,6-3 |
| ITF Women Altenkirchen Qual | 2018/02/18 09:00 | Sofia Shapatava v Sarah Beth Grey | 4-6,1-6 |
| Billie Jean King Cup | 2018/02/10 08:00 | Sofia Shapatava v Julia Grabher | 6-3,4-6,6-4 |
| Billie Jean King Cup | 2018/02/09 08:00 | Olga Danilovic v Sofia Shapatava | 6-3,6-0 |
| Billie Jean King Cup | 2018/02/08 08:00 | Sofia Shapatava v Isabella Shinikova | 3-6,3-6 |
| ITF Women Antalya | 2018/01/21 07:00 | Varvara Gracheva v Sofia Shapatava | 7-5,6-0 |
| ITF Women Antalya | 2018/01/19 07:30 | Lisa Matviyenko v Sofia Shapatava | 3-6,3-6 |
| ITF Women Antalya | 2018/01/18 10:00 | Eva Lys v Sofia Shapatava | 1-6,2-6 |